You can also prepare things to be easier to use with MoI's current single-edge-to-single-edge blend by running the Rebuild command on your curves before constructing surfaces from them, so that you've got surfaces in larger pieces instead of split up into smaller faces. With them configured like that you'll then be able to do just one blend to connect them, see the attached example.

But it's definitely a goal to improve Blend to make your original structure work for blending more easily too.

- Michael